Scarlet fever rash after treatment? Confused

My 3 year old was diagnosed with Scarlet fever 2 weeks ago today. Had the rash on the face and groin which faded / peeled after a few days on the pencillin. Back to normal, no temperature and well in herself. Yesterday she woke up with a cold, temperature of 37.2 which has gone down on its own now to 36.5 however in the last hour she had developed 2 red marks on her cheek, very similar looking to the ones she had with the scarlet fever. Surely the rash can't still be lingering? Or she's caught it again?!